How Do I Make a Channel Power Measurement?

How Do I Make a Channel Power Measurement?

Last updated: February 10, 2011

Before performing these procedures, ensure that you have specified the proper Amplitude Offset for your test setup, and that the test set has been properly calibrated (see Calibrating the Test Set ).

Measuring 3GPP TS 34.121 5.2A Maximum Output Power with HS-DPCCH

This section is applicable to the lab application or feature-licensed test application only.

3GPP TS 34.121 5.2A measures the UE's maximum output power when the HS-DPCCH is present. For ease of measurement, the test requires you to configure the UE such that the HS-DPCCH is always transmitted, and at a constant level. This is accomplished by setting DeltaACK , DeltaNACK and DeltaCQI to 8 , by setting CQI Feedback Cycle (k) to 4 ms and CQI Repetition Factor to 2 , and by setting Ack-Nack Repetition Factor to 3 (required because the test is performed using H-Set 1, which has an X00X00 data transmission pattern).

  1. Set parameters that can only be set in cell off operating mode (and other parameters that are set from the same menu):
    • Set Operating Mode ( F1 ) to Cell Off .
    • Select Channel (UARFCN) Parms ( F12 on Call Parms 1 of 3 ). Set DL Channel ( F7 ) and Uplink Channel ( F8 ) to the appropriate "low range" frequencies for your UE's operating band, as specified by 3GPP TS 34.108 5.1.1 (for example, for operating band II, set DL Channel = 9663 and Uplink Channel = 9263 ).
    • Select Uplink Parameters ( F4 on Call Control 2 of 5 ).
      • Set Uplink DPCH Bc/Bd Control to Manual .
      • Set Manual Uplink DPCH Bc to the value corresponding to the first 34.121 v7.0.0 Table C.10.1.4 sub-test you wish to test (for example, for sub-test 3, set Manual Uplink DPCH Bc to 15 ).
      • Set Manual Uplink DPCH Bd to the value corresponding to the first 34.121 v7.0.0 Table C.10.1.4 sub-test you wish to test (for example, for sub-test 3, set Manual Uplink DPCH Bd to 8 ).
      • Set Maximum Uplink Transmit Power Level to +21 dBm .
      • Note, Qqualmin and Qrxlevmin are fixed to -24 dB and -115 dBm, respectively, in the test set.
    • Set Operating Mode to Active Cell (pressing the CALL SETUP key quickly brings you back to the top level Call Control menu).
  2. Set Channel Type ( F8 ) to 12.2k RMC + HSDPA .
  3. Select HSDPA Parameters ( HSPA Parameters ( F10 ), F10 ).
    • Select HSDPA RB Test Mode Setup ( F8 ).
      • Set HS-DSCH Configuration Type to FRC (this is the default value).
      • Set FRC Type to H-Set 1 QPSK (this is the default value).
      • Set CN Domain as needed (by default it is set to PS Domain ). Note, before you can establish a connection in the PS domain, the UE must attach to the test set. To enable this, the PS Domain Information parameter (under Cell Parameters , F12 on Call Control 2 of 5 ) must be set to Present when the UE registers (attaches) with the test set.
    • Select HSDPA Uplink Parameters ( F11 ).
      • Set DeltaACK , DeltaNACK and DeltaCQI to 8 .
      • Set Ack-Nack Repetition Factor to 3 .
      • Set CQI Feedback Cycle (k) to 4 ms .
      • Set CQI Repetition Factor to 2 .
  4. Test Application: Press Cell Parameters ( F2 ).
    Lab Application: Press Cell Info ( F2 ), then Cell Parameters ( F2 ).
    ( from the Call Control 2 of 5 menu)
    • Set Default DPCH Offset (DOFF) to 3 x 512 chips .
    • Set PS Domain Information to Present (this is the default value in the lab application only) if you plan to establish the HSDPA connection in the PS domain (i.e. if you've set CN Domain to PS Domain in step 3 above).
  5. Select Generator Info ( F3 on Call Control 2 of 5 ), select Connected DL Channel Levels ( F4 ), then select HSDPA Conn DL Channel Levels ( F4 ).
    • Set Cell 1 Connected HSDPA CPICH Level to -10 dB (this is the default value).
    • Set Cell 1 Connected HSDPA P-CCPCH/SCH Level to -12 dB (this is the default value).
    • Set Cell 1 Connected HSDPA PICH Level to -15 dB (this is the default value).
    • Set Cell 1 Connected HSDPA DPCH Level to -9 dB .
    • Set Cell 1 Sum of Active Conn HS-PDSCH Levels to -3 dB (this is the default value).
    • Set Cell 1 Connected HS-SCCH 1 Level to -8 dB .
  6. Set any other parameters needed to establish a connection with your UE, then power on the UE and wait for it to register (attach). See Establishing an HSDPA Connection .
  7. Select Originate Call ( F3 on Call Control 1 of 5 ).
  8. Set Cell Power ( F7 on Call Parms 1 of 3 ) to -86 dBm/3.84 MHz .
  9. Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ).
    • Set UL CL Power Ctrl Mode to Active bits (this is the default value).
    • Set UL CL Power Ctrl Algorithm to Two (this is the default value). 34.121 specifies algorithm 1 in Annex I, but due to the fact that the test is performed with all up bits, either algorithm produces the same result.
  10. Set UE Target Power ( F7 on Call Parms 3 of 3 ) to a high value, such as 24 dBm . The test set drives the UE to the specified level (or simply continues to send all up bits if the UE does not reach that level), while also appropriately ranging the test set's measurement receiver.
  11. Select UL CL Power Ctrl Parameters ( F8 ). Set UL CL Power Ctrl Mode to All Up bits .
  12. Press the Measurement selection key.
  13. Select Channel Power .
  14. Set up the measurement:
    • Select Channel Power Setup (F1).
    • Set RRC Filter to Off (this is the default value), in order to measure "mean power".
    • Set Trigger Arm to Single , if desired.
    • Set Trigger Source to HS-DPCCH .
    • Set Measurement Interval to 666.7 us (one timeslot). This is the default value.
    • Select Close Menu ( F6 ).
  15. If you set Trigger Arm to Single , press the START SINGLE key to begin the measurement.
  16. Verify that the measured output power falls within the range specified by 34.121 Table 5.2A.2. For example, for sub-test 3 and a power class 3 UE, the output power must be 23 dBm +2.7/-3.7 dB.
  17. Repeat the test for "mid range" and "high range" frequencies (perform a Physical Channel Reconfiguration (Inter-frequency Hard Handover) , then repeat steps 14 and 15).
  18. Perform a Transport Channel Reconfiguration to change Beta c and Beta d to the values for any other 34.121 v7.0.0 Table C.10.1.4 sub-tests you wish to test (using the TCR Manual Uplink DPCH Bc and TCR Manual Uplink DPCH Bd settings), then repeat steps 14-16.
    Note, it is important that you properly configure all of the Transport Channel Reconfiguration parameters before executing the handover. For example, to maintain the proper settings for 5.2A, either set TCR Timing Indication (CFN Handling) to Maintain and TCR Relative DPCH Frame Offset to 0 chips or set TCR Default DPCH Offset (DOFF) to 3 x 512 chips . You must also set TCR DeltaACK , TCR DeltaNACK and TCR DeltaCQI to 8 , set TCR Ack-Nack Repetition Factor to 3 , set TCR CQI Feedback Cycle (k) to 4ms , and set TCR CQI Repetition Factor to 2 .

Measuring 3GPP TS 34.121-1 (v8.10.0) 5.2B Maximum Output Power with HS-DPCCH and E-DCH

This section is applicable to the lab application or feature-licensed test application only.

  1. Set parameters that can only be set in cell off operating mode (and other parameters that are set from the same menu):
    • Set Operating Mode ( F1 ) to Cell Off .
    • Select 34.121 Preset Call Configurations ( F11 on Call Parms 1 of 3 ) and select 5.2B, 5.9B, 5.10B, and 5.13.2B:HSPA:QPSK and then Sub-test 1 . You may then skip any steps marked with [34.121 Call Config] in this procedure.
    • Select Channel (UARFCN) Parms ( F12 on Call Parms 1 of 3 ). Set DL Channel ( F7 ) to the appropriate "low range" frequency for your UE's operating band, as specified by 3GPP TS 34.108 5.1.1 (for example, for operating band II set DL Channel = 9663 ).
    • [34.121 Call Config] Select Uplink Parameters ( F4 on Call Control 2 of 6 ).
      • [34.121 Call Config] Set Uplink DPCH Bc/Bd Control to Manual .
      • [34.121 Call Config] Set Manual Uplink DPCH Bc to 11 (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
      • [34.121 Call Config] Set Manual Uplink DPCH Bd to 15 (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
      • [34.121 Call Config] Set Maximum Uplink Transmit Power Level to 21 dBm .
    • Set Operating Mode to Active Cell (pressing the CALL SETUP key quickly brings you back to the top level Call Control menu).
  2. Set Cell Power ( F7 on Call Parms 1 of 3 ) to -86 dBm/3.84 MHz .
  3. [34.121 Call Config] Set Channel Type ( F8 ) to 12.2k RMC + HSPA (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
  4. [34.121 Call Config] Select Generator Info ( F3 on Call Control 2 of 6 ), select Downlink Channel Levels ( F3 ), and then Connected DL Channel Levels ( F3 ). Select HSPA Conn DL Channel Levels ( F4 ).
    • [34.121 Call Config] Set HSPA Cell 1 Connected CPICH Level to -10 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected P-CCPCH/SCH Level to -12 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected PICH Level to -15 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected (F-)DPCH Level to -10 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected E-AGCH Level to -20 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected E-HICH Level to -20 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected E-RGCH Level to Off (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected HS-PDSCHs Level (Sum) to -3 dB (this is the default value).
    • [34.121 Call Config] Set HSPA Cell 1 Connected HS-SCCH 1 Level to -8 dB .
  5. [34.121 Call Config] Select HSUPA Parameters ( HSPA Parameters ( F10 ), F9 ).
    • [34.121 Call Config] Select HSUPA RB Test Mode Setup ( F8 ).
      • [34.121 Call Config] Set E-DCH RLC SDU Size to 2936 (this is the default value) (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
    • [34.121 Call Config] Select Common HSUPA Parameters ( F9 ).
      • [34.121 Call Config] Set E-DPCCH/DPCCH Power Offset (DeltaE-DPCCH) to 6 (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1). Note, 34.121-1 Table C.11.1.3 provides Beta ec (209/225 for sub-test 1). To determine what value of DeltaE-DPCCH corresponds to this, use 3GPP TS 25.213 Table 1B and the value of Beta c from 34.121-1 Table C.11.1.3 (11/15 for sub-test 1). For sub-test 1, A ec = Beta ec /Beta c = (209/225)/(11/15) = 19/15; therefore DeltaE-DPCCH = 6.
      • [34.121 Call Config] Set Reference E-TFCI Power Offsets to Definition 34.121-01 (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
    • [34.121 Call Config] Select Serving Grant ( F10 ).
      • [34.121 Call Config] Set RB Setup AG to Index 26: (119/15)^2 (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1). Note, 34.121-1 Table C.11.1.3 AG Index corresponds to 3GPP TS 25.212 s4.10.1A.1 Table 16B, which maps the Absolute Grants sent on the E-AGCH. To send the equivalent Absolute Grant in the RB Setup message, you must use the AG Index in 3GPP TS 25.321 s9.2.5.2.1 Table 9.2.5.2.1.1.
  6. [34.121 Call Config] Select HSDPA Parameters ( HSPA Parameters ( F10 ), F10 ).
    • [34.121 Call Config] Select HSDPA RB Test Mode Setup ( F8 ), then HSDPA RB Test Mode Settings ( F8 ).
      • [34.121 Call Config] Set RB Test HS-DSCH Configuration Type to FRC (this is the default value).
      • [34.121 Call Config] Set FRC Type to H-Set 1 QPSK (this is the default value).
    • [34.121 Call Config] Select HSDPA Uplink Parameters ( F11 ).
      • [34.121 Call Config] Set DeltaACK , DeltaNACK and DeltaCQI to 8 (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1). .
      • [34.121 Call Config] Set Ack-Nack Repetition Factor to 3 .
      • [34.121 Call Config] Set CQI Feedback Cycle (k) to 4 ms .
      • [34.121 Call Config] Set CQI Repetition Factor to 2 .
  7. Test Application: Select Cell Parameters ( F2 ).
    Lab Application: Select Cell Info ( F2 ), then Cell Parameters ( F2 ).
    ( from the Call Control 2 of 6 menu)
    • Set PS Domain Information to Present (this is the default value in the lab application).
    • Qqualmin and Qrxlevmin are fixed to -24 dB and -115 dBm, respectively, in the test application. In the lab application these are the default values for these parameters. They are accessible from Cell Info , Reselection Parameters ( F3 ).
  8. [34.121 Call Config] Select RB Test Mode Setup ( F6 on Call Control 3 of 6 ) and set UE Loopback Type to Type 1 (this is the default value).
  9. [34.121 Call Config] Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ) and set UL CL Power Ctrl Algorithm to Two (this is the default value).
  10. Set any other parameters needed to establish a connection with your UE, then power on the UE and wait for it to register (attach). See Establishing an HSPA Connection .
    Note, before you can establish a connection in the PS domain (as is required for HSPA connections), the UE must attach to the test set. To enable this, the PS Domain Information parameter must be set to Present when the UE registers (attaches) with the test set.
  11. Select Originate Call ( F3 on Call Control 1 of 6 ).
  12. Drive the UE to the maximum power:
    • Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ) and set UL CL Power Ctrl Mode to Active bits (this is the default value) .
    • Set UE Target Power ( F7 on Call Parms 3 of 3 ) to 2 dBm (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1, power class 3 UE). This value is determined as follows: Maximum power for a power class 3 UE is +24 dBm, but UE Target Power only sets the DPCCH+DPDCH power level of the UE. In order to achieve a total output power of +16.5 dBm (24 dBm - 7.5 dB), you must set UE Target Power to at most 16.5 dBm - Power change due to HS-DPCCH, E-DPCCH and E-DPDCH .
      Power Change Due to HS-DPCCH, E-DPCCH and E-DPDCH = 10log 10 (Beta c ^2 + Beta d ^2 + Beta hs ^2 + Beta ec ^2 + Beta ed ^2) - 10log 10 (Beta d ^2 + Beta c ^2) = 14 dB for sub-test 1, so you must set UE Target Power to 2 dBm for sub-test 1.
      The UE Target Power values for sub-tests 2-5 are as follows: sub-test 2: 11 dBm, sub-test 3: 3 dBm, sub-test 4: 14 dBm, sub-test 5: 6 dBm.
    • Wait 150 ms.
    • Press the Measurement selection key and select Channel Power .
    • Set up the measurement:
      • Select Channel Power Setup ( F1 ).
      • Set Auto Range = On (or leave Auto Range = Off and set Manual Power Range to the Power Change Due to HS-DPCCH, E-DPCCH and E-DPDCH value calculated above).
      • Select Close Menu ( F6 ).
    • Observe the channel power measurement result to ensure that the UE's output power is at least 7.5 dB below max power (<16.5 dBm for power class 3 UEs).
    • Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ). Set UL CL Power Ctrl Mode to Alternating bits (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
    • Select Additional Screens ( F1 from Call Control 2 of 6 ), select HSPA Information ( F2 ) and observe the Last Received E-TFCI (it should be 75 for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1, 67 for sub-test 2, 92 for sub-test 3, 71 for sub-test 4 and 67 for sub-test 5).
    • Select E-TFCI Recording Information ( F3 ) (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1).
    • Select HSPA Parameters ( F10 ), HSUPA Parameters ( F9 ), E-TFCI Recording ( F11 ), E-TFCI Recording Parameters ( F7 ) (for 34.121-1 v8.10.0 Table C.11.1.3 sub-test 1):
      • [34.121 Call Config] Set E-TFCI Recording Count to 15 (this is the default value).
      • Select Send Step Up TPC Bit Pattern ( F10 ) and then Start Recording E-TFCI Values ( F8 ).
      • Observe whether the UE sent any decreased E-TFCI. If not, send another up TPC bit and record E-TFCI. Repeat until the UE sends at least one decreased E-TFCI.
      • Select Send Step Down TPC Bit Pattern ( F11 ) and then Start Recording E-TFCI Values ( F8 ).
      • Observe whether the UE sent any decreased E-TFCI. If it did, then send another down TPC bit, then continue to the next step. If not, continue to the next step.
      • Confirm that the E-TFCI is equal to the target E-TFCI of 75 for sub-test 1. If not, fail the UE. Note that an E-TFCI of 75 corresponds to an uplink data rate of 2421 bits/10 ms = 242 kbps. The uplink data rate for sub-test 2 = 175 kbps, sub-test 3 = 483 kbps, sub-test 4 = 206 kbps and sub-test 5 = 175 kbps.
  13. Measure channel power and determine whether the result is within the range specified by 3GPP TS 34.121-1 table 5.2B.5.
  14. To repeat this test for sub-tests 2-5:
    • Perform a Transport Channel Reconfiguration ( Handovers ( F5 )) to change the following settings:
      Sub-test 2-5 Transport Channel Reconfiguration settings
      Setting Sub-test 2 Sub-test 3 Sub-test 4 Sub-test 5
      TCR DPCH Bc/Bd Control Manual Manual Manual Manual
      TCR Manual Uplink DPCH Bc 6 15 2 15
      TCR Manual Uplink DPCH Bd 15 9 15 0
      TCR DeltaACK, DeltaNACK, DeltaCQI 8 8 8 0
      TCR Ack-Nack Repetition Factor 3 3 3 3
      TCR CQI Feedback Cycle (k) 4 ms 4 ms 4 ms 4 ms
      TCR CQI Repetition Factor 2 2 2 2
      TCR E-DPCCH/DPCCH Power Offset 8 8 5 0
      TCR Reference E-TFCI Power Offsets 34121-01 34121-02 34121-01 34121-03
      TCR Absolute Grant 18: (47/15)^2 21: (67/15)^2 23: (84/15)^2 18: (47/15)^2
    • For sub-tests 2-4, repeat steps 12 and 13.
    • For sub-test 5, end the call ( F3 ) and proceed as follows.
      • [34.121 Call Config] Set Channel Type ( F8 ) to HSPA .
      • [34.121 Call Config] Select HSUPA RB Test Mode Setup ( F8 ).
        • Set RB E-DPDCH Max Channel Codes (HSPA) to SF4 .
        • Set E-DCH RLC SDU Size to 11744 .
      • [34.121 Call Config] Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ) and set UL CL Power Ctrl Algorithm to One .
      • Select Originate Call ( F3 on Call Control 1 of 6 ).
      • Drive the UE to the maximum power:
        • Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ) and set UL CL Power Ctrl Mode to Active bits .
        • Set UE Target Power ( F7 on Call Parms 3 of 3 ) to 6 dBm (for power class 3 UE).
        • Wait 150 ms.
        • Observe the channel power measurement result (pressing the MEASUREMENT key quickly brings you to the channel power measurement screen) to ensure that the UE's output power is at least 7.5 dB below max power (<16.5 dBm for power class 3 UEs).
        • Select UL CL Power Ctrl Parameters ( F8 on Call Parms 3 of 3 ). Set UL CL Power Ctrl Mode to All Up bits .
        • Wait 150 ms.
      • Repeat step 13.
  15. End the call ( F3 ) and repeat the testing at mid and high range frequencies.

Measuring 3GPP TS 34.121 5.4.3 Minimum Output Power

  1. Ensure that you have specified the proper Amplitude Offset for your test setup.
  2. Set the downlink and uplink channels:
    • Set Operating Mode ( F1 ) to Cell Off .
    • Set DL Channel ( F10 ) and Uplink Channel ( F11 ) to the appropriate "low range" frequencies for your UE's operating band, as specified by 3GPP TS 34.108 5.1.1 (for example, for operating band I, DL Channel = 10563 and Uplink Channel = 9613 ).
    • Set Operating Mode to Active Cell .
  3. Establish an RB Test Mode connection between the UE and test set (see How Do I Set Up a Call and Make a Connection? ).
  4. Ensure that the Connected DL Channel Levels are set to their default values, as required by 3GPP TS 34.121 Table E.3.1 (select Generator Info , F3 on Call Control 2 of 5 ).
  5. Set Cell Power ( F7 ) to -93 dBm .
  6. Set Call Drop Timer ( F11 on Call Parms 2 of 3 ) to Off .
  7. Set UE Target Power :
    • Ensure that UL CL Power Ctrl Mode is set to its default value of Active Bits (select UL CL Power Ctrl Parameters , F8 on the Call Parms 3 of 3 menu).
    • Set UE Target Power ( F7 ) to -55 dBm.

    The test set then drives the UE to the specified level, while also appropriately ranging its measurement receiver.

  8. Return to the UL CL Power Ctrl Parameters menu ( F8 ) and set UL CL Power Ctrl Mode to All Down bits and ensure that UL CL Power Ctrl Algorithm is set to Two . The test set then drives the UE to transmit at the lowest level possible.
  9. Press the Measurement selection key.
  10. Select Channel Power .
  11. Set up the measurement:
    • Select Channel Power Setup (F1).
    • Ensure that RRC Filter is set to its default value of Off (to measure "mean power").
    • Set Trigger Arm to Single .
    • Ensure that Measurement Interval is set to its default value of 666.7 us (one timeslot).
    • Select Close Menu ( F6 ).
  12. Press the START SINGLE key to begin the measurement.
  13. Verify that the measured output power is less than -49 dBm.
  14. Repeat the test for "mid range" and "high range" frequencies (perform a Physical Channel Reconfiguration (Inter-frequency Hard Handover) , then repeat steps 11 and 12).

Related Topics

Channel Power Measurement Description

Channel Power Troubleshooting

Programming a Channel Power Measurement